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At least 253 records · Page 14

Magnetic field pulsations at ATS 1

Geomagnetic field measurements by ATS 1 in synchronous equatorial orbit, determining pulsations types during magnetically quiet and geomagnetic storm periods

Coleman, P. J., Jr.↗

Observations on pulsating auroras

Infrasonic pulsations of optical auroral luminosity in 3914 A positive molecular nitrogen ion and 5577 A O I emission measurement by double photometer system

Miller, R. E.↗

Total pressure averaging in pulsating flows

A number of total-pressure tubes were tested in a non-steady flow generator in which the fraction of period that pressure is a maximum is approximately 0.8, thereby simulating turbomachine-type flow conditions. Most of the tubes indicated a pressure which was higher than the true average. Organ-pipe resonance which further increased the indicated pressure was encountered within the tubes at discrete frequencies. There was no obvious combination of tube diameter, length, and/or geometry variation used in the tests which resulted in negligible averaging error. A pneumatic-type probe was found to measure true average pressure, and is suggested as a comparison instrument to determine whether nonlinear averaging effects are serious in unknown pulsation profiles. The experiments were performed at a pressure level of 1 bar, for Mach number up to near 1, and frequencies up to 3 kHz.

Krause, L. N.↗